But despite the new fame and celebrity friends (hey, Kendall Jenner and Hailey Baldwin) she's garnered along the way, Justine wanted her fans to know she'll never forget "where she came from."

On Saturday, Justine partnered with Tumblr in NYC as part of their Tumblr IRL series to celebrate the release of her debut album Ultraviolet. She invited her followers and fans, who've been supporting her since the beginning.

"Those who have been with me since DAY 1, know how special this moment was for me last night," wrote Justine on Instagram. "And how much of an achievement as well."

Setor Tsikudo

"I started off on Tumblr when I was 16 (thanks to my friend Jadé) and began to build this whole new world for me with people who changed my life, and honestly helped mold the story of who I am today musically and just as a person."

Setor Tsikudo

"From relationship to friendships, it all grew organically for me through Tumblr. From loitering around the streets of Soho, hanging in McDonalds doing absolutely nothing, lmao, making weird ass youtube videos just goofing around, and being care free teens."